FordExcursions.com Forums
FireFoxxy
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• Bakersfield, CA, USA |
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• Registered on 9/9/2005 |
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• 16 posts |
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 Posted:9/19/2005 10:05 |
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I recently bought the 01 V10 X, and was having the problem with it lunging forward while applying extra brake pressure to the pedal while stopped, and what I was wondering is, how hard is the brake pedal supposed to be? I can barely push mine down and it will stop me, there is no squish at all and it seems really stiff. Is this any kind of sign of something bad to come like a master cylinder going out or is this just an X's trait? I did have to stop suddenly from about 45 mph and it seemed to do ok I guess factoring in how much it weighs and all. But of course I am still concerned about the lunging after being stopped and plan on checking to see if the brakes need to be bled this weekend per someone's suggestion here. The fluid level seemed fine. I did also notice it is pulling slightly to the right while braking, but that shouldn't make it lunge should it? Or make the brake pedal super stiff?
The later models had adjustable brake and gas pedals right? Was that to make them less stiff or was that for people with longer or shorter legs?
Any advice is appreciated  Thanks! |
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JohnBoy
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• DFW, TX, USA |
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• Registered on 9/3/2002 |
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• 972 posts |
• 2 Vehicles
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 Posted:9/19/2005 11:48 |
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I've always thought "squishy" brake pedals were a sign of air in the lines since air compresses more than fluids....
so a firm pedal that stops fine is probably ok with me
Now the pulling or lunging is something you may want to look into...
pulling is usually a grabbing caliper, (who typed master cylinder ?)
lunging is ????? dunno.... sure you'r enot subconciously releases the brake a bit more than you think you are ?
but the adjustable pedals are just that so those thigh bone challenged people would not have to lay down in the seat to reach the pedals
IN 3 different ex's we've found we never moved them though 
2005 6.0L 4x4 Eddie Bauer Ex
2003 6.0L 4x4 Limited Ex - traded in (BooHoo )
"The Republicans should back off and let men marry men, women marry women, and legalize abortion. In three generations there would be no Democrats." |
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monsta
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• The Big Island, HI, USA |
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• Registered on 1/5/2002 |
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• 1,056 posts |
• 2 Vehicles
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Posted:9/19/2005 14:48 |
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| Quote: | | I recently bought the 01 V10 X, and was having the problem with it lunging forward while applying extra brake pressure to the pedal while stopped, and what I was wondering is, how hard is the brake pedal supposed to be? |
I'm a bit confused. But it [i]is[/i] early in the morning for me...
Are you saying that AFTER you're stopped and have your foot on the brake, when you push the brake pedal more the truck lunges forward or is it the pedal that lunges?? What is the truck's RPM when stopped? Does the pedal slowly sink when pushed down at a stop?
Also, pulling to one side doesn't have anything to do with the master cylinder but a slide problem on the caliper. Sounds as if one caliper engages slightly more than the other. Or the tire pressures could be unequal, or the alignment off, or a ball joint bad, or a steering linkage worn....
The stiff pedal seems to be a trait of the Excursion. My brakes feel wooden at times. I do not think air in the system would make them stiff. Seems to me it would make them squishy.
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FireFoxxy
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• Bakersfield, CA, USA |
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• Registered on 9/9/2005 |
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• 16 posts |
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 Posted:9/19/2005 16:38 |
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Well I'm glad to know that a hard brake is just the way the X is. My X actually lunges (inconsistantly albeit) forward after I am at a complete stop and I apply extra pressure to the pedal... It actually did it again yesterday and took me by surprise... I was adjusting my belt and lifted up slightly putting added pressure on the pedal when it lunged, scared me even though it doesn't move forward too much just enough to call it lunging. There are times too when in park, I can press on the brake pedal and the rpms go up to around 1000 and it sounds as though the engine revs up with the increased rpms... Someone else here said their X does this too.... This is the first out of 12 vehicles I have ever owned that does this although it does not consistently do it.
So I guess the line doesn't need to be bled but I wonder what else could it be?
Are the rods or lines that brake and excel near each other at all? Is it possible they could touch in some sort of way? This is just a really weird thing. |
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monsta
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• The Big Island, HI, USA |
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• Registered on 1/5/2002 |
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• 1,056 posts |
• 2 Vehicles
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Posted:9/19/2005 20:32 |
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Does the brake pedal move at all (ie. sink) when you add this "extra" pressure that causes the truck to lunge?
Since the throttle is cable actuated, I would take a looksee under there and see it any part of the pedal interferes or touches the throttle cable.
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glenn z
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• harrison twp., MI, USA |
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• Registered on 8/22/2003 |
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• 63 posts |
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Posted:9/20/2005 08:06 |
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my excursion does not change in idle when hitting brakes, nor should they, i have seen this issue somtimes tied into cruise control problem, in no way should the rpm increase 1000 rpm when hitting brakes
as for brake pulling, in no way is it the master, nor should the pedal be rock hard, the problem you explain would lead me to believe you have a caliper that is freezing up, if truck is pulling left when braking it is the right caliper and vise versa, what ever caliper IS working is the way the truck will pull because that is the brake that is grabing, the opposite side caliper will be the bad one
if the master was bad you would have different problems
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JohnBoy
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• DFW, TX, USA |
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• Registered on 9/3/2002 |
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• 972 posts |
• 2 Vehicles
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Posted:9/20/2005 11:36 |
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Oops - who typed master cylinder in my post ?!? !?/
A master cylinder NEVER grabs but calipers do
2005 6.0L 4x4 Eddie Bauer Ex
2003 6.0L 4x4 Limited Ex - traded in (BooHoo)
"The Republicans should back off and let men marry men, women marry women, and legalize abortion. In three generations there would be no Democrats." |
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Richard Smith
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• Knoxville, TN, USA |
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• Registered on 10/4/2003 |
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• 104 posts |
• 1 Vehicle
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Posted:9/20/2005 21:38 |
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firefoxxy,
I have a 2003 V-10 and I did not like the way the brakes performed from the factory. My complaints were poor stopping and at times,at a stop, the pedal would sink with pressure. I found this occurred on a down hill stop - like my driveway. The closeness of the brake pedal to the accelerator allowed the edge of my shoe to actually press on the accelerator. The harder I pushed on the brake pedal the more the truck would lung forward.
There are a lot of posts about V-10 brakes. Diesel trucks have a hydraulic assisted power brake. The V-10 uses a traditional Vacuum booster.
I had mine checked out by a dealer and was told the brakes were fine.
I changed my brake pads to PFC and changed to Stainless Steel brake lines. Performance was Improved 100 percent. I have 33000 miles on this combination and they are great in every way.
I have heard other Excursion V-10 drivers with this "lunging" complaint. My daughter-in-law has a 2003 V-10 Excursion and hers is the same as mine was. |
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FireFoxxy
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• Bakersfield, CA, USA |
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• Registered on 9/9/2005 |
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• 16 posts |
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Posted:9/25/2005 13:29 |
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Well Richard... when I first read your post I was thinking there could be no way I might have been pressing the gas pedal while I was braking but after I saw how close my foot comes to the gas pedal as well, I am now not sure whether this was the actual cause..... I figure I might try to simulate what I did before and see just how much the X lunges, this might help me to know if I was just pressing the gas while braking with the edge of my shoe. Frankly I hope that was all it is. Except for the fact that when in park I was able to press on the brake and raise the rpm's a few times by about 1000. Not every time, but a few times. I appreciate all the input and I will look into this further.
Marcia
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monsta
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• The Big Island, HI, USA |
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• Registered on 1/5/2002 |
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• 1,056 posts |
• 2 Vehicles
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Posted:9/26/2005 14:26 |
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I'm beginning to think that you have a vacuum leak somewhere. Since the brake booster relies on vacuum created by the engine, a leak would theoretically make the engine think it isn't giving enough and thereby raise the RPM to compensate.
It could also explain the heavy brake feel since the booster isn't doin' all it is suppose to.
I'd have the vacuum lines inspected and see if the dealer can test the lines and operation of the booster itself.
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